应用生态学报2017，Vol.28Issue(12)：3891-3898,8.DOI:10.13287/j.1001-9332.201712.005
放牧作用下高寒草甸群落物种分布与土壤因子的关系
Relation between species distribution of plant community and soil factors under grazing in alpine meadow
摘要
Abstract
The research selected the alpine meadow located in the northeastern margin of the Qinghai-Tibet Plateau to study the changes of vegetation community and soil properties under different grazing intensities,as well as the quantitative relation between the distribution patterns of plant species and the physical and chemical properties of soil.The results showed that the grazing caused the differentiation of the initial vegetation community with the dominant plants,Elymus nutans and Stipa grandis.In the plots with high and low grazing intensities,the dominant plants had changed to Kobresia humilis and Melissitus ruthenica,and E.nutans and Poa crymophila,respectively.With the increase of grazing intensity,the plant richness,importance value and biomass were significantly decreased.The sequence of plant species importance value in each plot against grazing intensity could be fitted by a logarithmic model.The number of required plant species was reduced while the importance value of the remaining plant species accounted for 50％ of the importance value in the whole vegetation community.The available P,available K,soil compaction,soil water content,stable infiltration rate and large aggregate index were significantly changed with grazing intensity,however,the changes were different.The CCA ordination showed that the soil compaction was the key factor affecting the distribution pattern of the plant species under grazing.The variance decomposition indicated that the soil factors together explained 30.5％ of the distribution of the plant species,in particular the soil physical properties alone explained 22.8％ of the distribution of the plant species,which had the highest rate of contribution to the plant species distribution.The soil physical properties affected the distribution pattern of plant species on grazed alpine meadow.关键词
高寒草甸/群落特征/放牧强度/土壤因子Key words
alpine meadow/community characteristics/grazing intensity/soil factor引用本文复制引用
牛钰杰,杨思维,王贵珍,刘丽,杜国祯,花立民..放牧作用下高寒草甸群落物种分布与土壤因子的关系[J].应用生态学报,2017,28(12):3891-3898,8.基金项目
本文由国家重点研发项目(2016YFC0501902)和国家自然科学基金项目(31460635)资助 This work supported by the National Key Basic Research Program (2016YFC0501902) and the National Natural Science Foundation of China (31460635). （2016YFC0501902）
